Counterweighted sectional door.



C'. C. TOMKINSON.

COUNTERWEIGHTED SECTIONAL DOOR. APPLICATION mm mm 15. 19:7.

Patfintedl Dec. 4., 1917.

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Y EFL ELM- /%M/ WM CHARLES C. TOIVIKINSON, F PLAINFIELD, NEW JERSEY, ASSIGNOR T0 J. EDWARD OGDEN, OF MOUNTAINVILLE, NEW YORK.

COUNTERWEIGHTED SECTIONAL DOOR.

i-92 I@9 ?55 Specification of Letters Patent. Pamgmt gm D m 11911? I v I Application filed July 16,1917 Serial'lto. l80,69& V i

To all whom it may concern: r shown somewhat in detail .in Fig. 3, com- Be it known that T, CHARLES C. ToMKIN- prises a flat vertical member 13 which forms sort, a citizen of the United States of Amera track for a roller 34 and spaced therefrom ice, and a residentof Plainfield, Union a parallel roller guide 14.

county, and State of NewJersey, have in- The door comprises a'central section vented certain new and useful Improvements suspended by links 21 which are pivoted at in Counterweighted Sectional Doors, of 22 above the door opening and to brackets which the following is a specification, refer- 23 on the upper-corners of the central door ence being bad to the accompanying drawsection. 24 is a lower section and 25 an upin ings, forming a part thereof. per section. On each of the vertical edges My invention relates to new anduset ul imof the central section 20 are two channel provements in doors of the three section type irons 26 and 27 between the flanges of which and particularl to a counterweighting sysare spaces in which slidably fit the flanges tem therefor. ore specifically it relates to of angle irons 28 and 29 on the lower and 15 a three-section door of which the central upper door sections respectively. These section is suspended by pivoted links and parts form guides'for the lower and upper over opposite sides of which the lower and door sections and hold the three sections toupper sections slide into registering "posigether. tions. Doors of t is general type are adept- Sheaves 30 are rotatively supported in the 20 ed to close large openings such as the doorbrackets 23 and chains or cables passing 7 5 5 1 ways of Warehouses, pier sheds and the like, over these sheaves are fastened to the lower and consequently are heavy structures. corners of the upper door section at 31 and Their operation is difficult unless some suitto the upper corners of the lower door Seeable wa of counterweighting them is protion at 32 Brackets 33 on the lower corners 25 vided. eretofore no way has been known of the lower door section support, the rollers for counterweighting doors of this specific 34. Hoisting chains 35 are also connected to type and the particular object of this inventhese brackets and run up to an overhead tion is to overcome this difliculty and to prohoisting mechanism 36.

. vide a simple and edective counterweighting Counterweights 37 are attached to chains 30 system torsuch doors. or cables whichrun up over sheaves38 and In order. that my invention may be thordown to the lower corners of the central oughly understood I will now proceed to de door section 20 to which they are attached scribe the same in the followm specification at 39.

fand'then point out the novel eatures there- Short bars 40 project laterally from the 35 of in'appendedclaims. Y ceniral door section near the upper part Referring to the drawlngszthereof and when the door is closed are en- ]Figure 1 is a sectional side elevation of e gaged by latches 41 which are pivoted at 42 three-section door of the type to which th1s to the roller guides 14 and are pressed by invention relates with my improvement consprings 43 into latching position. 44 are re- ;40 -nected therewith, the door being shown initS lease bars pivoted to the edges of the lower closed position. door section at .45 and pressed by springs 46 c Fig. 2 is a similar View of the same parts in one direction against stop pins 48.

" with the door shownin its open position. I will now describe the operationof this Fig. 3 is a sectional plan view of some of apparatus. An upward pull on the hoistin 7 M5 the parts one larger scale. The section in chains35 will raise section 24 and this wil this figure is taken on the line 3-3 of Fig. 1. allow section 25 .to run down. This moveig. 4 is an end elevation of a latch mechment will continue until the three door secanismwhich appears in the other figures of tions are in registering positions. Just as the drawings. the lower section is about to reach the limit to L lliike characters ofreference designate corof its movement relative to the central sec 1 05, responding parts in all the figures. tion 20, the release bars 44 will raise the 10 designates a part of the structure of a latches 41 and unlock the bars 40. building, 11 the part thereof which forms The relative movement of section 24 over the lintel of a door opening, and 12 the side section 20 is limited by a-stop 16 allixed to 5 5' posts of the door opening. The latter as the upper edge of section 20. Further upward movement of the hoisting chains will result in the rollers 34 continuing their upward vertical movement but the three door sections will now be swung inwardly by the links 21 until they reach a horizontal position. During this part of the operation the counterweight 37 will move downwardly and assist in raising the door sections.

In closing the door the movement of chains 35 is reversed. First the door sections swing down until they reach a vertical position, when the latches 41 catch the bars 40. The release bars l4: being free to swing about their pivots against the action of springs 46 will prevent them from interfering with the latching operation. The lower section 24 is somewhat heavier than the upper section 25 so that as it descends from its position back of the central section 20 it will raise the upper section. The use of a latch arrangement makes it possible to have the weight 37 heavier than that of the door section 20, so that it will assist in raising all of the door sections.

I intend no limitations other than those imposed by the appended claims.

What I claim is:

1. A door comprising three sections, links pivotally suspending the central section from above the door opening, guide connections between the door sections to provide for a vertical telescoping movement of said sections, means for guiding vertically the lower part of the lower door section, a flexible connection between the upper and lower door sections for balancing said sections during their. telescoping movement, and a counterweight for said sections connected with the lower part of the central door section.

2. A door comprising three sections, links pivotally suspending the central section from above the door opening, guide connections between the door sections to provide for a vertical telescoping movement of said sections for balancing said sectionsduring their telescopin movement,'n1eans for guiding vertically t e lower part of the lower sections, a counterweight for said sections connected with the lower part of the central door section, and means releasable by the telescoping movement of the door sections for holding said central door section in a vertical position.

3. A door comprising three sections, links pivotally suspending the central section from above the door openin guide connece tions between the door sections to provlde for a vertical telescoping movement of said sections, means for balancing said sections during their telescopingv movement, means for guiding vertically the lower part of the lower section, a counterweight for said sections heavier than the central door section connected with the lower part thereof, a latch for catching the central door section when it swings into vertical position, a release bar on one of the other door sections for releasing said latch during the telescoping movement of the sections, said release bar being pivoted to prevent interference with the catching operation of the latch.

4:. A door comprising three sections, links pivotally suspending the central section from above the door opening, the lower section being heavier than the upper section, guide connections between the door sections to provide for a vertical telescoping movement of said sections, sheaves at the upper corners of the central door section, means for guiding vertically the lower part of the lower door section, flexible connections between the upper and lower door sections running over said sheaves for balancing said sections during their telescoping movement, hoisting chains connected with the lower corners of'the lower door section, and a counterweight for said sections connected with the lower part of the central door section.

5. A door comprising three sections, links pivotally suspending the central section from points near the upper corners thereof and points above the door opening, the lower section being heavier than the upper section, guide connections between the door sections to provide for a vertical telescoping movement of said sections, sheaves near the upper corners of the central section, rollers connected with the sides of the lower section near the lower part thereof, means for guiding said rollers vertically, hoisting chains connected with the lower section near said rollers, flexible connections running over said sheaves from the lower corners of the upper section to the upper corners of the lower section, and a counterweight for said section connected with the lower corners of the central section.

6. A door comprising three sections, links pivotally suspending the central section from points near the upper corners thereof and points above the door opening, the lower section being heavier than the upper section, guide connections between the door sections to provide for a vertical telescoping movement of said sections, sheaves near the upper corners of the central section, rollers connected with the sides of the lower section near the lower part thereof, means for guiding said rollers vertically, hoisting chains connected with the lower section near said rollers, flexible connections running over said sheaves from the lower corners of the upper section to the upper corners of the lower section, a counterweight heavier than the central section connected with the lowerand mew/ea m corners thereof, pivoted latches at the sides catching operation of the latches during the of the central section, transverse bars proclosing operation of the door.

jecting from the central section under said In witness whereof, I have hereunto set latches when the door is closed, and pivoted my hand this 12 day of July, 1917. 10

F release bars on the lower section arranged CHARLES C. TOMKINSON.

to ralse and release said latches during the Witnesses: telescoping movement of the sections and I. B. MOORE, to swing to prevent interference with the D. E. DEU'rscH. 

